The article presents the characteristics of toughened steels, their mechanical properties and production methods. Special emphasis is given to metallurgical purity and the deterioration of plastic properties accompanied by an increase in mechanical properties. The study also emphasises the advantages of using steels characterised by higher mechanical properties and discusses problems occurring during welding very high-strength steels. Special attention is given to cold cracking, welding-induced HAZ softening and failing to obtain a required level of toughness in the weld and HAZ. The article also provides information about criteria related to the selection of filler metals.